Explain why : a) it is difficult to burn a piece of wood fresh from a tree . b) pouring dry sand over the fire extinguishes it . c) it is difficult to use hydrogen as source of energy .
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The fresh wood has water in it which makes it difficult to catch fire
b) it blocks out the external oxygen from the fire which is the source of fire thus dry sand works as the fire extinguisher
c) Due to its highly flammable nature it is not used as a source of energy
b) it blocks out the external oxygen from the fire which is the source of fire thus dry sand works as the fire extinguisher
c) Due to its highly flammable nature it is not used as a source of energy
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